public class Guilu {
    public static void main(String[] args){
        int a=1,b=1,c=0;
        int num1,num2;
        for(int i=3;i<=12;i++){
            c=a+b;
            num1=b;
            num2=c;
            a=num1;
            b=num2;
        }
        System.out.println(c);
    }
}
